linux-kernel - [PATCH v4 12/14] drm/mediatek: use layer_nr function to get layer number to init plane

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Message-ID: <1533780949-30141-13-git-send-email-stu.hsieh@mediatek.com>
Date:   Thu, 9 Aug 2018 10:15:47 +0800
From:   Stu Hsieh <stu.hsieh@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>
CC:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        Stu Hsieh <stu.hsieh@...iatek.com>
Subject: [PATCH v4 12/14] drm/mediatek: use layer_nr function to get layer number to init plane

This patch use layer_nr function to get layer number to init plane

When plane init in crtc create,
it use the number of OVL layer to init plane.
That's OVL can read 4 memory address.

For mt2712 third ddp, it use RDMA to read memory.
RDMA can read 1 memory address, so it just init one plane.

For compatibility, this patch use mtk_ddp_comp_layer_nr function
to get layer number from their HW component in ddp for plane init.

Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 21 ++++++++++++++-------
 drivers/gpu/drm/mediatek/mtk_drm_crtc.h |  1 -
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 2d6aa150a9ff..845d1608465e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -45,7 +45,8 @@ struct mtk_drm_crtc {
 	bool				pending_needs_vblank;
 	struct drm_pending_vblank_event	*event;
 
-	struct drm_plane		planes[OVL_LAYER_NR];
+	struct drm_plane		*planes;
+	unsigned int			layer_nr;
 	bool				pending_planes;
 
 	void __iomem			*config_regs;
@@ -286,7 +287,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 	}
 
 	/* Initially configure all planes */
-	for (i = 0; i < OVL_LAYER_NR; i++) {
+	for (i = 0; i < mtk_crtc->layer_nr; i++) {
 		struct drm_plane *plane = &mtk_crtc->planes[i];
 		struct mtk_plane_state *plane_state;
 
@@ -351,7 +352,7 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
 	}
 
 	if (mtk_crtc->pending_planes) {
-		for (i = 0; i < OVL_LAYER_NR; i++) {
+		for (i = 0; i < mtk_crtc->layer_nr; i++) {
 			struct drm_plane *plane = &mtk_crtc->planes[i];
 			struct mtk_plane_state *plane_state;
 
@@ -403,7 +404,7 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 		return;
 
 	/* Set all pending plane state to disabled */
-	for (i = 0; i < OVL_LAYER_NR; i++) {
+	for (i = 0; i < mtk_crtc->layer_nr; i++) {
 		struct drm_plane *plane = &mtk_crtc->planes[i];
 		struct mtk_plane_state *plane_state;
 
@@ -450,7 +451,7 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	if (mtk_crtc->event)
 		mtk_crtc->pending_needs_vblank = true;
-	for (i = 0; i < OVL_LAYER_NR; i++) {
+	for (i = 0; i < mtk_crtc->layer_nr; i++) {
 		struct drm_plane *plane = &mtk_crtc->planes[i];
 		struct mtk_plane_state *plane_state;
 
@@ -598,7 +599,12 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 		mtk_crtc->ddp_comp[i] = comp;
 	}
 
-	for (zpos = 0; zpos < OVL_LAYER_NR; zpos++) {
+	mtk_crtc->layer_nr = mtk_ddp_comp_layer_nr(mtk_crtc->ddp_comp[0]);
+	mtk_crtc->planes = devm_kzalloc(dev, mtk_crtc->layer_nr *
+					sizeof(struct drm_plane),
+					GFP_KERNEL);
+
+	for (zpos = 0; zpos < mtk_crtc->layer_nr; zpos++) {
 		type = (zpos == 0) ? DRM_PLANE_TYPE_PRIMARY :
 				(zpos == 1) ? DRM_PLANE_TYPE_CURSOR :
 						DRM_PLANE_TYPE_OVERLAY;
@@ -609,7 +615,8 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 	}
 
 	ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
-				&mtk_crtc->planes[1], pipe);
+				mtk_crtc->layer_nr > 1 ? &mtk_crtc->planes[1] :
+				NULL, pipe);
 	if (ret < 0)
 		goto unprepare;
 	drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
index 9d9410c67ae9..60bcc8aba8e3 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
@@ -18,7 +18,6 @@
 #include "mtk_drm_ddp_comp.h"
 #include "mtk_drm_plane.h"
 
-#define OVL_LAYER_NR	4
 #define MTK_LUT_SIZE	512
 #define MTK_MAX_BPC	10
 #define MTK_MIN_BPC	3
-- 
2.12.5.2.gbdf23ab